The typical asking rate per listing is in the $20's per square foot per year. The Bradenton region is going through a a rise in rates. In the last 3 months, the median rate rose $7 per sqft per year. That's a 42% rise in rent.
In the last 90 days, 11 listings have come on the market, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,150 sqft. Most buildings in this area are around 1 stories. Most buildings in this market were built in 1925 and are Class B.